Read / Write execution control pin. (This pin is only used in parallelinterface)
This pin is not used in serial interfaces and should be connected to VDD1

16~23

D7~D0

The bi-directional data bus of the MPU interface. When CSB is “H”, they are high impedance
If using serial interface:
D0 is the SDA signal in 4-Line & 3-Line interface
D1 is the A0 signal in 4-Line interface

24

/WR/(R/W)

Read / Write execution control pin. (This pin is only used in parallel interface)
This pin is not used in serial interfaces and should be connected to VDD1

25

A0(SCL)

The function of this pin is different in parallel and serial interface
In parallel interface: A0 is register selection input
A0 = "H": inputs on data bus are display data
A0 = "L": inputs on data bus are command
In serial interface: this pad will be used as SCL (serial-clock) input